A 25-year-old man is in custody after allegedly killing his former girlfriend, her family and her new boyfriend in an Austrian skiing town.

The Austrian news agency APA reported the man turned himself in to police in the Alpine town of Kitzbuehel, east of Innsbruck, and admitted to the five slayings early on Sunday (local time).

Police say the suspect went to his former girlfriend’s family home at 4am on Sunday but left when her father opened the door.

They say he retrieved his brother’s pistol from his own home and returned.

Police allege he shot the father as he opened the door, then shot his former girlfriend’s brother in his bedroom.

After killing her mother, police say he climbed over a balcony into his ex-girlfriend’s room and killed the 19-year-old woman and her 24-year-old boyfriend.

According to local publication Kurier, the suspect had separated from his former girlfriend two months ago.

He is believed to have encountered his ex-partner and her current boyfriend on Saturday night when an argument ensued.